Patents by Inventor Ernst C. Wettstein

Ernst C. Wettstein has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of comminuting rare earth powder for producing rare earth magnet
    Patent number: 4641787
    Abstract: A method of comminuting a rare earth metallic alloy powder by impact milling for facilitating formation of an improved rare earth magnet.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: February 10, 1987
    Assignee: Polaroid Corporation
    Inventors: Christian C. Petersen, Ernst C. Wettstein